kmsKeyId

The ARN, key ID, or alias of the KMS key that Secrets Manager uses to encrypt new secret versions as well as any existing versions with the staging labels AWSCURRENT, AWSPENDING, or AWSPREVIOUS. If you don't have kms:Encrypt permission to the new key, Secrets Manager does not re-ecrypt existing secret versions with the new key. For more information about versions and staging labels, see Concepts: Version.

A key alias is always prefixed by alias/, for example alias/aws/secretsmanager. For more information, see About aliases.

If you set this to an empty string, Secrets Manager uses the Amazon Web Services managed key aws/secretsmanager. If this key doesn't already exist in your account, then Secrets Manager creates it for you automatically. All users and roles in the Amazon Web Services account automatically have access to use aws/secretsmanager. Creating aws/secretsmanager can result in a one-time significant delay in returning the result.

You can only use the Amazon Web Services managed key aws/secretsmanager if you call this operation using credentials from the same Amazon Web Services account that owns the secret. If the secret is in a different account, then you must use a customer managed key and provide the ARN of that KMS key in this field. The user making the call must have permissions to both the secret and the KMS key in their respective accounts.